Larval and small juvenile cod Gadus morhua concentrated in the highly productive areas of a shelf break front
The early life of cod was studied during a survey programme covering the northeastern North Sea, the Skagerrak and the Kattegat in May 1992. Our aim was to asses the interrelated effects of physical and biological factors on distribution, growth and survival of larval cod. In the present paper we de...
Published in: | Marine Ecology Progress Series |
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Format: | Article in Journal/Newspaper |
Language: | English |
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1995
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Online Access: | http://hdl.handle.net/11250/108404 https://doi.org/10.3354/meps125021 |
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ftimr:oai:imr.brage.unit.no:11250/108404 2023-05-15T16:19:16+02:00 Larval and small juvenile cod Gadus morhua concentrated in the highly productive areas of a shelf break front Munk, Peter Larsson, Per Olov Danielssen, Didrik S. Moksness, Erlend 1995-09-14 1304145 bytes application/pdf http://hdl.handle.net/11250/108404 https://doi.org/10.3354/meps125021 eng eng urn:issn:0171-8630 http://hdl.handle.net/11250/108404 http://dx.doi.org/10.3354/meps125021 21-30 125 Marine Ecology Progress Series cod torsk Journal article Peer reviewed 1995 ftimr https://doi.org/10.3354/meps125021 2021-09-23T20:15:55Z The early life of cod was studied during a survey programme covering the northeastern North Sea, the Skagerrak and the Kattegat in May 1992. Our aim was to asses the interrelated effects of physical and biological factors on distribution, growth and survival of larval cod. In the present paper we describe the identified nursery areas of larvae/juveniles and analyse the connection between the distribution of cod and hydrographical (frontal) characteristics of the areas. A total area of 67000 km(2) was covered by stations in a 10 x 10 nautical mile grid. Salinity, temperature, NO3+NO2 and chlorophyll concentration were profiled through the water column. Zooplankton were sampled by a submersible pump and abundance of fish larvae/juveniles were estimated by depth-integrating tows of a 2 m ring net. The hydrographical measurements indicated a shelf break front positioned along the shelf slope in the southern part of the investigation area, and within the zone of the front we observed enhanced primary production and abundance of both phyto- and zooplankton. The distribution of larval and juvenile cod was also related to the hydrography, the abundance of cod peaked within a restricted zone and the aggregations extended as a continuous band along the front. We suggest that the observed concurrence between a hydrographic front and cod larvae/juveniles is a general and recurrent phenomenon based on the spawning habits of cod and aggregation due to flow convergence at the front. Article in Journal/Newspaper Gadus morhua Institute for Marine Research: Brage IMR Kattegat ENVELOPE(9.692,9.692,63.563,63.563) Marine Ecology Progress Series 125 21 30 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
cod torsk |
spellingShingle |
cod torsk Munk, Peter Larsson, Per Olov Danielssen, Didrik S. Moksness, Erlend Larval and small juvenile cod Gadus morhua concentrated in the highly productive areas of a shelf break front |
topic_facet |
cod torsk |
description |
The early life of cod was studied during a survey programme covering the northeastern North Sea, the Skagerrak and the Kattegat in May 1992. Our aim was to asses the interrelated effects of physical and biological factors on distribution, growth and survival of larval cod. In the present paper we describe the identified nursery areas of larvae/juveniles and analyse the connection between the distribution of cod and hydrographical (frontal) characteristics of the areas. A total area of 67000 km(2) was covered by stations in a 10 x 10 nautical mile grid. Salinity, temperature, NO3+NO2 and chlorophyll concentration were profiled through the water column. Zooplankton were sampled by a submersible pump and abundance of fish larvae/juveniles were estimated by depth-integrating tows of a 2 m ring net. The hydrographical measurements indicated a shelf break front positioned along the shelf slope in the southern part of the investigation area, and within the zone of the front we observed enhanced primary production and abundance of both phyto- and zooplankton. The distribution of larval and juvenile cod was also related to the hydrography, the abundance of cod peaked within a restricted zone and the aggregations extended as a continuous band along the front. We suggest that the observed concurrence between a hydrographic front and cod larvae/juveniles is a general and recurrent phenomenon based on the spawning habits of cod and aggregation due to flow convergence at the front. |
format |
Article in Journal/Newspaper |
author |
Munk, Peter Larsson, Per Olov Danielssen, Didrik S. Moksness, Erlend |
author_facet |
Munk, Peter Larsson, Per Olov Danielssen, Didrik S. Moksness, Erlend |
author_sort |
Munk, Peter |
title |
Larval and small juvenile cod Gadus morhua concentrated in the highly productive areas of a shelf break front |
title_short |
Larval and small juvenile cod Gadus morhua concentrated in the highly productive areas of a shelf break front |
title_full |
Larval and small juvenile cod Gadus morhua concentrated in the highly productive areas of a shelf break front |
title_fullStr |
Larval and small juvenile cod Gadus morhua concentrated in the highly productive areas of a shelf break front |
title_full_unstemmed |
Larval and small juvenile cod Gadus morhua concentrated in the highly productive areas of a shelf break front |
title_sort |
larval and small juvenile cod gadus morhua concentrated in the highly productive areas of a shelf break front |
publishDate |
1995 |
url |
http://hdl.handle.net/11250/108404 https://doi.org/10.3354/meps125021 |
long_lat |
ENVELOPE(9.692,9.692,63.563,63.563) |
geographic |
Kattegat |
geographic_facet |
Kattegat |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
21-30 125 Marine Ecology Progress Series |
op_relation |
urn:issn:0171-8630 http://hdl.handle.net/11250/108404 http://dx.doi.org/10.3354/meps125021 |
op_doi |
https://doi.org/10.3354/meps125021 |
container_title |
Marine Ecology Progress Series |
container_volume |
125 |
container_start_page |
21 |
op_container_end_page |
30 |
_version_ |
1766005630125998080 |